Electric lamp



L. O. PARKER Feb. 4, 1930.

ELECTRIC LAMP Fi'led June 13. 1927 Patented Feb. 4, 1930 UNITED STATES- PATENT OFFICE LESLIE O. PARKER, OI .ANDERSON, INDIANA, ASSIGNOR TO DELOO-BEMY CORPORA- TION OIF DAYTON, OHIO, A. CORPORATION OF DELAWARE M02310 LAMP Application fled June 18,

This invention relates to a lens for a rear signal lamp adapted to be used in connection with automotive vehicles.

It is among the objects of the present invention to provide a lens which Wlll distinctly transmit a stop signal.

Further objects and advantages of the pres ent invention will be apparent from the following description, reference beinghad to the accompanying drawings, wherein a preferred form of embodiment o the present invention is clearly shown.

In the drawings:

Fig. 1 illustrates a signal lamp 1n front elevation in which the lens is used;

Fig. 2 is a sectional view taken along the line 22 of Fig. 1;

Fig. 3 isan enlarged fragmentary vlew showing one of thedepressions in the lens forming a letter of the word Stop;

Fig. 4 is a detail section taken along the line 4 4 of Fig. 3; and

Fi 5 is a detail sectional View taken along the line 55 of Fig. 3.

Referring to the drawing, the signal lamp 20 is shown having a frame 21 in which the lens 22 is supported so that the rear surface 23 of said lens is substantially vertical as shown in Fig. 2.

The front face of the lens is provided with a plurality of concavo-cylindrical flutes 24; arranged vertically for spreading the light sidewise. This front face of the lens is inclined to the rear surface of said lens so as to reflect light in a direction inclined to a lane at right angles to the said rear surface 0 said shows this inlens. The present drawin clination so that the refraction of the light is upwardly inclined as regards said plane.

The rear face of the lens described by the numeral 25 is provided with a pluralit of depressions 26 which form the letters 0 the word Stop or other legend. As shown in the drawing, the depressions are com arative- 1y deeper adjacent the bottom of the ens than they are at the top. The innersurfaces of the depressions are provided with a plurality of raised (portions. 27, quarter-s herically shaped an arranged in spaced, orizontal rows as shown in the Fig. 3. The spherically 1927. Serial No. 188,406.

shaped surfaces of the raised portions are adapted to refract the light strikin them in an upwardly direction. The flat si es of said raised portions are on the upper side, or more specifically that side toward the top of the lens. The rear surface of the lens not depressed is opaqued so that assage of light through this portion is su stantially prevented.

Light passing from the lamp 30 provided in the signal device 20 is reflected by the reflector 31, the rays strikin the raised portions in the depressions of t e lens and being deflected u wardly. The inclined fluted front face 0 the lens also tends to direct these rays in an upwardly direction so that the stop signal is clearly discernible within an area substantially at the level of the eyes of the which tend to tranimit the light within the.

depressed ortion o the lens, thereby causing the word Stop formed by said depression to stand out distinctly.

I claim as my invention:

1. A lens for a signal lamp comprising, depressions in the rear face thereof which form the letters of a legend, the inner surfaces of said depressions having quarterspherically shaped raised areas arranged in spaced, horizontal rows and having their bases toward the top of the lens to direct light upwardly by refraction.

2. A lens for a signal lamp comprising, depressions in the rear face thereof which form the letters of a legend, said depressions varying in depth so that the inner surfaces thereof are inclined to the rear surface of the lens, said inner surfaces being provided with 'quarterspherically shaped raised areas arranged in spaced, horizontal rows.-

3. A lens for a signal lamp comprising, depressions in the rear face of the lens which form the letters of a legend, the inner surfaces of said depressions having quarter-spherically shaped raised areas, spaced and arranged in spaced horiz ntal rows, the flat sides of the paid raised areas being toward the top of the ens.

4. A lens for a signal lamp comprising, a front face provided with concavo-cylindrical flutes, arranged vertically and inclined to the rear surface of the lens, the rear face of said lens having depressions which form the letters of a legend, the inner surface of said depressions having quarter-spherically shaped raised areas, spaced, and arranged in spaced horizontal rows, the portion of the rear face of the lens not depressed being rovided with an opaque surface substantial y to prevent light from passing through the lens portion other than those provided with the quarterspherically shaped raised ortion.

5. A lens for a signal amp comprising, depressions in the rear face thereof which form the letters of a legend, spaced raised portions arranged in spaced horizontal rows, said raised portions being in the form of segments of prisms having their bases disposed toward the top of the lens to direct light upwardly by refraction.

6. A lens for a signal lamp formed to provide letters and a contrasting background, the letter area being formed to provide a series of segments of prisms having their bases disposed toward the top of the lens to throw light upwardly.

7. A lens for a signal lamp formed to pro vide letters and a contrasting background, the letter area being formed to provide a series of segments of prisms having their bases disposed toward the top of the lens to throw light upwardly, said segments likewise tapering toward a side of the lens to produce lateral spread of light.

8. A lens for a signal lamp comprising depressions in the rear face thereof which form the letters of a legend, the bottoms of said depressions being formed to provide a series of segments of prisms having their bases disposed toward the top of the lens to throw light upwardly.

9. A lens for a signal lamp comprising de-' pressions in the rear face which form the letters of a legend, said depressions being set in a contrasting background, the bottoms of said depressions being formed to provide a series of segments of prisms having their bases disposed toward the top of the lens to throw light upwardly.

In testimony whereof I hereto aflix my LESLIE O. PARKER.

signature. 

